LIFE SCIENCE

Detailed explanation-1: –As it is clear from the given option that grass is a producer but wheat and mango are not consumers. These are items eaten but do not eat lower level components.

Detailed explanation-2: -Option A: Primary consumers are those animals which consume the producers-the green plants. Grass is an example of a producer which makes the cow a primary consumer and thereby this option is a perfect fit.

Detailed explanation-3: -Primary consumers use some of the energy to live and grow, and they store the rest of the energy. For example, rabbits and deer are primary consumers because they eat grass.